Effect of boron substitution on the properties of NiZnCu ferrite for multilayer chip inductors

The initial permeability of the toroidal core sample with boron substituted NiZnCu ferrite (Ni0.36Zn0.44Cu2.2Fe1.96−xBxO4(x=0.0, 0.2, 0.4, 0.6, and 0.8)) which was annealed at 900°C for 2h decreased from 162.4 to 123.2 as boron concentration x is increased from 0.2 to 0.8. The quality factor and density of 0.2mol% boron substituted NiZnCu ferrites sintered at 900°C for 2h was about 240.0 and 4.84g/cm3, respectively. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature. It was shown that the boron substituted NiZnCu ferrite systems were promising as a high quality factor material in the fabrication of multilayer chip inductors (MLCIs).